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Glossary
sample counter
SE
self-calibrating
sensor
settling time
Shannon Sampling
Theorem
S/H
signal conditioning
SNR
software trigger
software triggering
source impedance
SS
S/s
PCI-4451/4452 User Manual
the clock that counts the output of the channel clock, in other words, the
number of samples taken. On boards with simultaneous sampling, this
counter counts the output of the scan clock and hence the number of scans.
single-ended—a term used to describe an analog input that is measured
with respect to a common ground
a property of a DSA board that has an extremely stable onboard reference
and calibrates its own A/D and D/A circuits without manual adjustments by
the user
a device that responds to a physical stimulus (heat, light, sound, pressure,
motion, flow, and so on), and produces a corresponding electrical signal
the amount of time required for a voltage to reach its final value within
specified limits
a law of sampling theory stating that if a continuous bandwidth-limited
signal contains no frequency components higher than half the frequency
at which it is sampled, then the original signal can be recovered without
distortion
sample-and-hold—a circuit that acquires and stores an analog voltage on a
capacitor for a short period of time
the manipulation of signals to prepare them for digitizing
signal-to-noise ratio—the ratio of the overall rms signal level to the rms
noise level, expressed in decibels
a programmed event that triggers an event such as data acquisition
a method of triggering in which you simulate an analog trigger using
software. Also called conditional retrieval.
a parameter of signal sources that reflects current-driving ability of voltage
sources (lower is better) and the voltage-driving ability of current sources
(higher is better)
simultaneous sampling—a property of a system in which each input or
output channel is digitized or updated at the same instant
samples per second—used to express the rate at which a DAQ board
samples an analog signal
G-16
© National Instruments Corporation
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